@article{VMUMM_1987_1_a5,
     author = {V. V. Tkachuk},
     title = {The smallest subring of the ring $C_p(C_p(X))$, containing $X\cup\{1\}$ and everywhere dense in $C_p(C_p(X))$},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {20--23},
     year = {1987},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1987_1_a5/}
}